Removed prototype button atom

refs https://github.com/TryGhost/Team/issues/931

- prototype button has served it's purpose in answering questions and is no longer being used
- groundwork is left in place for future component-based atoms

ghost/admin/lib/koenig-editor/addon/components/koenig-atom-button.hbs

@@ -1,21 +0,0 @@
-<a href="https://ghost.org" class="gh-btn"
-    {{on "mouseover" (fn (mut this.isHovered) true)}}
-    {{on "mouseleave" (fn (mut this.isHovered) false)}}
->
-    <span>{{@atom.value}}</span>
-</a>
-
-{{#if this.isHovered}}
-    <KgActionBar @class="absolute" @style={{this.toolbarStyle}} @isVisible={{true}} @instantClose={{this.koenigUi.inputHasFocus}}>
-        <li class="ma0 lh-solid">
-            <button
-                type="button"
-                title="Delete button"
-                class="dib dim-lite link h9 w9 nudge-top--1 justify-center"
-                {{on "click" this.deleteButton}}
-            >
-                {{svg-jar "koenig/kg-trash" class="fill-white w4 h4"}}
-            </button>
-        </li>
-    </KgActionBar>
-{{/if}}

ghost/admin/lib/koenig-editor/addon/components/koenig-atom-button.js

@@ -1,12 +0,0 @@
-import Component from '@glimmer/component';
-import {action} from '@ember/object';
-import {tracked} from '@glimmer/tracking';
-
-export default class KoenigAtomButtonComponent extends Component {
-    @tracked isHovered = false;
-
-    @action
-    deleteButton() {
-        // noop
-    }
-}

ghost/admin/lib/koenig-editor/addon/options/atoms.js

@@ -1,11 +1,9 @@
 // Atoms are effectively read-only inline cards
 // Full docs: https://github.com/bustle/mobiledoc-kit/blob/master/ATOMS.md
 
-import createComponentAtom from '../utils/create-component-atom';
+// import createComponentAtom from '../utils/create-component-atom';
 
-export const ATOM_COMPONENT_MAP = {
-    button: 'koenig-atom-button'
-};
+export const ATOM_COMPONENT_MAP = {};
 
 export default [
     // soft-return is triggered by SHIFT+ENTER and allows for line breaks
@@ -16,6 +14,5 @@ export default [
         render() {
             return document.createElement('br');
         }
-    },
-    createComponentAtom('button')
+    }
 ];

ghost/admin/lib/koenig-editor/addon/options/key-commands.js

@@ -419,31 +419,6 @@ export const DEFAULT_KEY_COMMANDS = [{
 
         return false;
     }
-}, {
-    str: 'META+SHIFT+B',
-    run(editor, koenig) {
-        if (!koenig.feature.emailCardSegments || !editor.range.headSection.isMarkerable) {
-            return;
-        }
-
-        editor.run((postEditor) => {
-            const texts = [
-                'Hit me!',
-                'Hit me!',
-                'Hit me!',
-                'Hit me slowly',
-                'Hit me quick',
-                'Hit me with your rhythm stick!'
-            ];
-
-            const buttonText = texts[koenig.koenigUi.buttonCount % texts.length];
-            koenig.koenigUi.buttonCount += 1;
-
-            const button = postEditor.builder.createAtom('button', buttonText);
-            const endPos = postEditor.insertMarkers(editor.range.head, [button]);
-            postEditor.insertText(endPos, ' ');
-        });
-    }
 }];
 
 // key commands that are used in koenig-basic-html-input

ghost/admin/lib/koenig-editor/addon/services/koenig-ui.js

@@ -6,8 +6,6 @@ export default class KoenigUiService extends Service {
     @tracked inputHasFocus = false;
     @tracked isDragging = false;
 
-    buttonCount = 0;
-
     #focusedCaption = null;
 
     captionGainedFocus(caption) {

ghost/admin/lib/koenig-editor/app/components/koenig-atom-button.js

@@ -1 +0,0 @@
-export {default} from 'koenig-editor/components/koenig-atom-button';